Machine for forming insulating-bushings.



Patented lun 25, I90l.

T. PAI

ING LATING BUSHINGS.

n filed Mar. 18, 1901. v

No. 677,26l.

MACHINE FOR FORM (Applicatio UNITED STATES PATENT OFFICE.

HENRY T. PAISTE, OF PHILADELPHIA, PENNSYLVANIAL MACHINE FOR FORMINGINSULATING-BUSHINGS.

SPECIFICATION formingpart of Letters Patent No. 677,261, dated June 25,1901.

Application filed March 18, 1901. Serial No. 51,683. (No model.)

To a whom it may concern.-

Be it known that I, HENRY T. PAISTE, a citizen of the United States,residing in Philadelphia, Pennsylvania, haveinvented certainImprovements in Machines for Forming Insulating-Bushings, of which thefollowing is a specification.

My invention relates to an improved machine for molding sheet materialinto any desired form, and more particularly to a machine for forminginsulated linings or bushings.

It has for its object the provision of a device by which aproperly-shaped blank cut from a sheet of material may be held prior toand during the time in which it is being forced into a die by a plunger.This object I attain as hereinafter set forth, reference being had tothe accompanying drawings, in which Figure 1 is a perspective view of myimproved device. Fig. 2 is a plan view of the same, showing it inposition on the plate of a bushing-forming machine. Fig. 3 is a verticalsectional view on the line 3 3, Fig. 2. Fig. at is a vertical sectionalview of a modification. Fig. 5 is a side view of the blank from which abushing is to be formed, and Fig. 6 is a perspective view of a finishedbushing.

It will be understood that while I describe my invention as applied tothe manufacture of insulating-bushings from sheet fiber the saidinvention may be used with equal advantage in forming sheet material ofany composition into any desired form.

The process hitherto employed in the manufacture of fiber bushingsrequired the raw material to be in the shape of a tube, so that it wouldremain on a plunger without requiring outside assistance to preventdistortion while the bushing was in process of being formed. By myinvention a bushing is formed from a piece of sheet fiber, the blankfrom which it is shaped being of such form that the complete bushing issmooth and evenly finished at all parts.

The raw material employed is in the form of sheets, which material canbe much more efficiently and economically used than the tubing hithertoemployed.

In the drawings, A and B are the plunger and die, respectively, of abushing-forming machine, the plunger being connected to a suitablesource of power by mechanism designed to periodically move it into andout of the die. The upper part a of the plunger is made of the samediameter as the part b of the die, while the part a is made less indiameter than this by an amount equal to double the thickness of thematerial operated upon. The part a is less by a similar amount than thepart b of the die, and in operation the part a of the plunger is loweredto a predetermined point, depending upon the dimensions of the bushingto be formed.

A guiding-mold 0, preferably made in two pieces 0 c, hinged together, isheld to the upper surface of the die by a bolt 0 which passes throughthe hinge projections of the said two pieces and is suitably fastened tothe die. In the present instance this mold is cylindrical in form, andthe opening through it is the same diameter as the part a of theplunger. One of the halves c has a locking-arm d pivoted thereto, inwhich is a recess d, constructed to engage a projection d from the half0 when the mold is in its closed position. The bolt 0 is so placed onthe die that the mold C may be brought into position on the die in whichthe opening through it is concentric with the axis of the plunger and ofthe die. In order that said mold may be retained in this position, Ipreferably provide a dowel-pin 11 set in the die and projecting slightlyabove its top surface, there being a recess therefor in each of theparts 0 and c of the mold.

In forming a bushing for the inside of an incandescent-lamp socket, forexample, I first stamp or otherwise cut out a piece of fiber E, shapedas shown in Fig. 5, said shape being obtained by the development of afinished bushing. Theplungerbeingraised,thepiece of fiber E is bent byhand into an approximately cylindrical form and placed in said mold; butwhen a pivoted or hinged former, such as that indicated in Figs. 1 and 2of the drawings, is used the fiber is placed in the opened former andthe latter then closed, by which action the sheet material is bent intocylindrical form. The locking-bar dis moved so that the projection 61 onthe half c" of the mold engages with the recess 61 and clamps the moldin its closed position, the various parts of the device being relativelyplaced as shown in the modification in Fig. at. The appropriatemechanism then causes the plunger A to descend, and the shoulder formedby the enlarged part a thereof engages the upper edge of the piece E andforces it through the mold into thedie B, the said mold guiding it andholding it in position while it is being moved into said die. Theplunger enters the die until the shoulder between the parts co and athereof comes against the material to be formed on the correspondingshoulder between the parts I) and b of said die, after which it iswithdrawn.

The mold is opened by throwing over the clamping-bard and swinging thetwo parts 0 and c on their pivot, after which the finished bushing ofthe shape shown in Fig. 6 may be removed.

The mold O is not necessarily made in halves, as,-if desired, it mayconsist simply of a cylindrical piece 0, as shown in Fig. 4;, heldpivotally between the arms of a Y- shaped lever F, pivoted at f toaswinging arm-piece F. 0 when moved up or down by the lever F alwaysmaintains its axis coincident with that of the plunger and die, therebeing pins b b in the upper surface of the die for the purpose ofretaining it in a fixed position while the machine is in operation. gerbeing raised, a rolled-up piece of material may be inserted in the moldand the bushings formed as above explained, the mold 0 being raised bymeans of the lever F to remove the samewhen finished.

It is to be noted that while the bushing formed by my improved machinehas a cut up one side where the two edges of the blank come together, bymaking the said blanks accurately these edges may be made to matchperfectly, and the said bushing when inside of a shell of anincandescent-lamp socket has been found to meet all practicalrequirements, the said out in actual use not having been founddisadvantageous.

I do not herein claim the insulating-shell for incandescent-lampsockets, as hereinbefore described, and shown in the accompanyingdrawings, as that forms the subject-matter of an application for patentfiled by me June 8, 1901, Serial No. 63,682.

I claim as my invention 1. The combination of a die, having in it acavity greatest in diameter at the top thereof, aplunger constructed toperiodically enter said cavity, with a mold made in two parts andconstructed to hold a piece of material By this construction the piecetobe molded, means for clamping the parts of the mold together, theplunger when reciprocated passing through the mold and forcing anymaterial therein into the die, substantially as described.

2. A die having in it a cavity largest in diameter at the top, a plungersimilar in form to .the opening in the die, a shoulder on said plungerand a former or mold on the die constructed with its internal diameterequal to the diameter of the shoulder on the plunger and also to theinternal diameter of the die at the top thereof, substantially asdescribed.

3. The combination of a die, a plunger arranged to travel into said dieand having on it a shoulder, a contractible former or mold mounted infront of the die concentricwith the axis of the plunger and constructedto bend a blank of sheet material into cylindrical form, and means forforcing, the plunger, with the blank, through the former and into thedie, substantially as described.

4. Thecoinbination in a machine for forming insulating-bushings, of adie, a plunger and a former or mold constructed to bend a piece of sheetmaterial into a cylindrical form, with means for causing the plunger topass through the mold and to engage the said material, thereby forcingit into the die, substantially as described.

The pluniof two cylindrical sections of difierentdiameter and havingalso a shoulder larger in diameter than either of the said sections, and

. 5. The combination of a plunger consisting a die having in it a cavitysimilar in shape to the shape of the sections of the plunger, with amold or former having through ita cylin- I drical opening equal indiameter to the shoulder on the plunger, substantially as described.

6. The combination of a die, amold or former thereon having through it acylindrical opening, means for maintaining said mold concentric with thecavity in the die, a plunger provided with a shoulder equal in diameterto the internal diameter of the mold, said plunger having its head of ashape similar to the opening within the die, being constructed to passthrough the mold, and to force any materialtherein into the die, substantially as described. p

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses. H

HENRY T. PAI STE.

Witnesses: WILLIA E. BRADLEY, Jos. H. KLEIN.

